VideoGamePerfection.com | spacesaver | Activity https://videogameperfection.com/members/spacesaver/activity/ Activity feed for spacesaver. Mon, 04 May 2026 08:00:53 +0100 https://buddypress.org/?v= en-US 30 hourly 2 4a27eb69cc4a82eca02d6f9251b17b33 spacesaver replied to the topic v.1.7 not working even after JTAG flashing; how to debug? in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/v-1-7-not-working-even-after-jtag-flashing-how-to-debug/#post-65875 Tue, 29 Apr 2025 11:02:32 +0100 Hurray again. Audio input is back now. The replacement ADC and LDO regulator arrived from DigiKey today and I’ve installed them.  I had a difficult time aligning the pins for soldering. I even ripped 1 of the traces when trying to realign, but miraculously, it was the IOVDD line, which can be shared with DVDD next to it.

]]> 7cf102d427231c504e6db23ebad906d9 spacesaver replied to the topic v.1.7 not working even after JTAG flashing; how to debug? in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/v-1-7-not-working-even-after-jtag-flashing-how-to-debug/#post-65807 Wed, 23 Apr 2025 06:03:10 +0100 Hurray! it’s back after desoldering the audio ADC. I got no HDMI output at 1st because the U6 regulator was damaged and only outputting 1.7V. I fed U5 into U6 and got HDMI to work. I noticed the VGA signal was noisy around sharp edges, which is what you warned since analog power is supposed to be separate from noisy digital ones.

Very glad this…Read more

]]> b1dfdc399225313fc0003dddd21e6e8e spacesaver replied to the topic v.1.7 not working even after JTAG flashing; how to debug? in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/v-1-7-not-working-even-after-jtag-flashing-how-to-debug/#post-65787 Mon, 21 Apr 2025 07:21:13 +0100 This guy also had a broken U6 regulator. https://videogameperfection.com/forums/topic/trying-to-repair-a-dead-ossc-u6-and-u1-were-replaced-boots-but-no-test-pattern/

Aha, I know 1 thing that’s broken for sure: the PCM1862 ADC  (U8). I injected 3.3V externally through the U6 regulator output pin and it draws ~10A ! I touched all the chips that it…Read more

]]> 0b52d8478bd51958a2eca34e557847d5 spacesaver replied to the topic v.1.7 not working even after JTAG flashing; how to debug? in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/v-1-7-not-working-even-after-jtag-flashing-how-to-debug/#post-65782 Mon, 21 Apr 2025 01:32:07 +0100 Hmm, on my OSSC 1.7, U5 is this regulator and the 3.3V output pin is the middle of the 3.

https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5011/AMS1117.pdf

I don’t know how to tell if I have the reference design or a clone. I bought it in 10/2023 for $184 on eBay, so it seemed reputable.

Anyways, U5 is OK, as far as I can tell.

I…Read more

]]> c89cf3605a3d2f586e9894a3ebebb909 spacesaver replied to the topic v.1.7 not working even after JTAG flashing; how to debug? in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/v-1-7-not-working-even-after-jtag-flashing-how-to-debug/#post-65780 Sun, 20 Apr 2025 11:43:32 +0100 Thanks for the tip. The oscillator is fine. All the regulators seem fine except U6

u5  3.3V       # the ground pin is not the middle one like you said here https://videogameperfection.com/forums/topic/ossc-1-5-trouble/
u6  0.12V     # the output pin has a ~1 ohm resistance to ground. Some kind of short?
u7 1.9
u9 1.8

u12 1.2
u13 2.5
u14 1.2
u15…Read more

]]> 6779fe06fcd3e631825c6cf3394e4028 spacesaver started the topic v.1.7 not working even after JTAG flashing; how to debug? in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/v-1-7-not-working-even-after-jtag-flashing-how-to-debug/ Wed, 16 Apr 2025 07:02:02 +0100 My v1.7 stopped working after the 3.5mm audio input cable touched the metal chassis of another power supply. Don’t know what that means.  Maybe it caused static damage. I don’t think it would cause current flow, assuming the audio input has very high impedance.

LED back light is still on and I can reflash the 0.90-aud  firmware with JTAG in Q…Read more

]]> cbe9dd2bcb68e8350884c1db59cc73a9 spacesaver replied to the topic How to flash with J-Link in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/how-to-flash-with-j-link/#post-65697 Fri, 11 Apr 2025 05:07:01 +0100 Pretty disappointing. I thought J-Link supported everything. Apparently not, or Altera decided to use some proprietary debug protocol built on top of JTAG. I’ve found a used Terasic probe on eBay, so will use that.

]]> e03eb618562df9941b3cbaa5c90e41c8 spacesaver replied to the topic How to flash with J-Link in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/how-to-flash-with-j-link/#post-65688 Thu, 10 Apr 2025 13:02:10 +0100 OK, I found the mapping.  https://www.segger.com/products/debug-probes/j-link/accessories/adapters/intel-fpga-adapter. What wasn’t clear earlier is   TRGNCE & TRGNCSO.

But apparently, the JLink 9.3 I have doesn’t support Cyclone IV.

no Cyclone IV

Connecting to J-Link via USB…O.K.
Firmware: J-Link V9 compiled May 7 2021 16:26:12
Hardware version: V9…Read more

]]> f2326a8a5efec572792becbc6715a3a4 spacesaver started the topic How to flash with J-Link in the forum OSSC - DIY & Repair Support https://videogameperfection.com/forums/topic/how-to-flash-with-j-link/ Wed, 09 Apr 2025 13:25:07 +0100 My OSSC 1.7 stopped booting (no text on LCD). What is the pin out if I want to reflash with a J-Link? I can’t figure how these pins map to those on the 10 pin connector:

https://www.segger.com/products/debug-probes/j-link/technology/interface-description/

https://www.terasic.com.tw/wiki/Terasic_USB_Blaster_revB_Manual

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